Xstrainer



(No Model.)

D. B, GOTHAM'. STRAINER.

Patented Deo. lll, 1894.

a f A 'raras DARWIN co'rnAM, or wnrnnfrown, NEW voeu.

creatura,

SEECFCAllON'forming part' of Letters Patent No. 530,586, dated December11, i'. Application filed December 8| 1893. Serial No. 493103- (N0model-l To aZZwe/cm it may concern:

Beit known that I, DARWiN B. GOTHAM, 'of Watertown, in the county ofJefferson, in the State of New York, have invented new and usefulImprovements in Strainers, ot which the following, taken in connectionwith the accompanying drawings, is a full, clear, and exact description.l

My invention relates to `improvements iu strainersof the'A class setforth in my United States Patent No. 511,770, granted to me Jannary 2,1894, and has forits objectl the production of a simple device, which isextremely strong and rigid,is highly efficient, and continuous inaction, operates with a minimum amount of rattling, and is soconstructed as to prevent blowing of air through the strained materialand consequent displacement there- ,ofyaud to this end it consists.iuthedetail construction and arrangement of the parts, all ashereinafter more particularlydescribed and 'pointed out in the claims.

In describing this invention, referenceis had to the accompanyingdrawings, forming apart of this specification, in which like let- Figurel is an. isometric perspective ot my improved strainenillustrating thegeneral construction and\arraugement of its parts. Fig. 2 is alongitudinal vertical sectional view, partly in elevation, of the upperportion of the strainenas seen in Fig. l, and Fig; 3 is a transversevertical sectional view, taken on line 3 3, Fig. 2.'l 4

The frame A of -my invention is. provided at its opposite'ends withstandards B B having their lower extremities secured together bylongitudinal tie bars C C connected by cross bars c, and said frame Aconsists of upper and lower sections c a hinged together atcorresponding edges by hinges c3.

The upper section c of the frame-Aie formed with a vat D for receivingthe unf strained material, and at the base ofthe ch am ber D is a screenplate d securedito suitable supports as cross ,bars d and shculders cl2.The unstrained pulp isadmitted into this vat D in any desired manner,and, as presently described, passes outwardly through the per iforations ofthe screen plated.

Beneath the. screen plate dis a seriesof stationary suction chambers Eseparated 'by partitions consisting of packing strips e and the crossbars ci directly above said strips, and at the base of the suctionchambers are diaphragmsE secured at their edges to the lower walls ofsaid chambers.4 The diaphragms E are forced up and down by plungers F,presently described, and by the operation of said diaphragme, a suctionis produced in the chambers E, and the unstrained material is drawn fromthe vat D through the vscreen plate d into said'chambers E.

The strained material passes from the suotion chambers E into outletpassages Ve e', which extend downwardly from the adjacent, edges of eachpair of the suction chambers.' Beneath each pair ot the outlet passagesis an outlet chamber G, which extends transversely across the frame A,and is Vformed with a projecting frontend extendingbeyond the twoopenings g in the outlet'chamber G and having its central portion formedwith a depending outlet nipple G2, whence the strained material isconducted by anysuit-y able construction of piping.

lt will be particularly noted that the conii bined depth of theoutlet'passage e' and the outlet chamber Gcommunicating therewith isconsiderably greater thanV the depth ofthe suction chamber vdischargingthereinto, and also that the upper outlet chamber Gforms a liquid sealbetween the chambers G and the nipple G2. This is an `essential feature,as, if said parts -'are otherwise constructed, there is moreorlessliability of air being blown through the outlet passage and chamberand Aeffecting agitation and displacement of the strained material, and.i-mpairing thecontinu-v ity of its iow. This result is positively pre,

vented by the construction of liquid seal in my present machine, and, inits practical o|peration, the strained material flows quietly and ycontinuously from the outlet chambers.A This and eective arrangement ofreceiving cham- IOO 1 is obviously a particularly simple, practical,

lby a check nutf. The lower end of each of the plunger rods f isv passedthrough and extends beneath a bearing 1l of a bracket I secured to .oneof the cross bars c between the longitudinal tie bars C. The lower endof this bracket is provided with an oil chamber i and with a bearing t2arranged at an angle with the former bearing i.

A shaft I' is journaled in the bearings t2, and is provided with cams Jeach having the lower portion of its engaging face movable in thecorresponding oil chamber t" for lubricating said face. plunger rod f isprovided. )with a head f4 arranged beneath the corresponding bearing i,and this head lis formed with a dovetail groove]e alignedwith theadjacent caml J and within which is removably secured a lengthwiselytapering wearing piece f6 of copper, lignum-vit, or other materialsofter than the engaging face of the cam J. The cams J are arranged soas to operate s/uccess.- ively, so as to cause the plungers to movesimultaneously and oppositely in pairs, and are each formed with anabrupt incline j for forcing the plungers upwardly Aat greater speedthan the saine descend in order to effect cleaning of thescreen plate dby the upward movement of the plungers.

It frequently happens that the screen plate of strainers now in use ismore or less clogged, and a considerable depth of unstrained material issupported above the same, and consequently an insufficient amount ofpulp is supplied to the suction chambers, and, as it is evidentlyimpractical to stop the rotation of the actuating shaft of the strainer,the coutinued movement of the plungers produces a considerable vacuumwithin the suction chambers, and thereby causes great strain upon theparts, and frequently fractures o'r detac'ncs the diaphragmsor otherwiseinjures the strainer. tirely obviated by my improved strainer, since theplunger rods are entirely disconf nected from their actuating cams, andthe plungers are forced downwardly by the action of the springs il,only, which are evidently not sufficiently strong to produce an unduevacuum. indeed, if a vacuum should be produced, the springs are unableto act against the vacuum, and the actuating shaft and the cams carriedthereon, revolve freely Without engaging the wearing strips or withouteiecting any strain or injury to the parts,

duced in this machine.

The lower end of each,v

This undesirable result is on and particularly of the diaphragme. Assoon, however, as the vacuum is disturbed by unclogging the screenplateof the chamber -D and the normal supply of strained material toIthe suction chambers, the springs H force the lower end of theplungorrods, or, more strictly speaking, the wearing pieces f6 intoengagement with the actuating cams, and straining of the materialcontinues. Except in rare instances, however, no vacuu n1 will beprosVhen a plunger descends-supposin g the screen plate above it to beclogged-a partial vacuum is formed within the suction chamberbut thestrained material within the outlet passage e and the outlet chamber Gwill, by the weight of the material within the upper outlet G', flowinto the suction chamber E and relieve the vacu um forming therein; yetthe, disposition of that the plunger in one chamber rises as the otherdecends,tends to force material into the outlet chamber G just atthe'time it is needed to rise through the passage e into the othersuction chamber E to overcome the vacuum forming therein. All this willtake place without, however, permitting any air to enter either suctionchamber, because of the water seal formed in the upper outlet chamber G.This peculiar construction and arrangement of plunger rods, actuatingcams, and springs H are also extremely eflicient in preventing rattlingof the parts, since, even though said pieces f6 become considerablyworn, the f springs II force the same into contact with the faces of theactuating cams, and said parts operate as effectively as though newwearing pieces were in use. This action of is also prevented by theextremely rigid con-l struction of support therefor, since the bearingsfor the driving shaft are separated but a slight distance, are extremelylong, are formed integral with the brackets provided with the bearingsfor the lower endsof the plunger rods, and are rigidly secured uponshort cross bars having their opposite ends firmly supported upon thelongitudinal bars C U, which are extremely rigid and strong.

It will be evident upon reference to the foregoing description and anexamination of the drawings that' my invention is simple, extremelystrong and rigid, is highly eiiicient and continuous in action, operateswith a minimum amount of rattling, and is so-con structed as to preventblowing of air through the strained material and 4 consequentdisplacement thereof and to also prevent injury or breakage of theparts.

lIaving thus fully described my invention, what I claim as new, anddesire to secure by Letters Patent, is

the springs ll may be facilitated by the adi 1. I n y a strainer, thecombination of a vat for receiving the unstrained material provided witha screen plate through which the material is strained, stationarysuction chaml bers at one side of said'screen plate, a down-- wardlyextending outlet passage opening mally stationary vat`for receiving theunstrained material provided with a screen plate through which thematerial is strained, stationary suction chambers each arranged at oneside of the screen plate, a downwardly extending outlet passage openingfrom each suction chamber, an outlet chamber arranged beneath each pairof the outlet passages and opening therefrom and having one end thereofextending beyond the corresponding wall' of theadjacent suction chamber,an upper outlet chamber arranged above the end of the former outletchambers and having its opposite ends provided with inlets registeredwith the outlets in the ends of the former outlet chambers, said upperoutlet chamber forming a water seal and being provided with au outlet atits central portion, substantially as and for the purpose specited.

In testimony whereof I have hereunto signed my name, in thepresence oftwo attesting witnesses, at Brownville, in the county of Jeerson, in theState-of New York, this 4th day of December, 1893.

i DARWIN B. GOTHAM.

Witnesses:

ORVILLE HAIGHT, MERRITT D. GorHAM.

